Stem Cells

Question 1

the ectoderm layer of gastrula is comprised of?

a. bone tissue
b. epidermis
c. red blood cells
d. neurons
e. pigment cells

Answer 1

b,d,e

Question 2

the mesoderm layer of gastrula is comprised of?
a.notochord
b. epidermis
c. bone tissue
d. red blood cells
e. pigment cells
f. facial 
muscle
g. tubule cell of the kidney

Answer 2

a,c,d,f,g

Question 3

the endoderm layer of gastrula is comprised of?

a. epidermis
b. facial muscle
c. stomach cells
d. thyroid cells
e. bone tissue
f. lung cells
g. neurons of brain

Answer 3

c,d,f

Question 4

stem cells can…

a. replicate themselves
b. differentiate into many cell types
c. differentiate into specific cell types
d. a and b
e. a and c

Answer 4

d

Question 5

totipotent stem cells generate what cell types?

Answer 5

all cell types

Question 6

pluripotent stem cells generate what cell types?

Answer 6

all embryonic germ layers

Question 7

multipotent stem cells generate what cell types?

Answer 7

limited cell types based on tissue of origin

Question 8

unipotent stem cells generate what cell types?

Answer 8

only one type of cell

Question 9

how many cells are maximally contained in the blastocyst?

a. ~42
b. 15
c. ~64
d. ~67

Answer 9

c

Question 10

what are the three methods of transgenics?

Answer 10

pro-nuclear injection

embryonic stem cells

nuclear transfer

Question 11

what type of egg is used in nuclear transfer? what is the process?

Answer 11

enucleated egg (no nucleus) you insert nucleus of a differentiated adult cell into an egg

Question 12

mesenchymal stem cells differentiate based on different signals which could be due to what?

Answer 12

transcription factors

Question 13

how are pluripotent stem cells formed?

Answer 13

modified using TFs